Steps:
1. Unscrew the existing aerator from the faucet spout.
If it's too tight to remove by hand, use an adjustable wrench or pliers.
2 Cover the sink's drain hole with a rag, then turn on the water to flush out the faucet spout.
3 Carefully thread a new aerator onto the faucet spout; tighten it by hand only.

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